碱激发泡沫混凝土早期稳定行为及机理

Early Stability Behavior and Mechanism of Alkali-Activated Foamed Concrete

研究了不同种类泡沫在碱性环境和碱激发泡沫混凝土中的早期稳定时变行为.结果表明:相比植物型、动物蛋白型发泡剂,复合型发泡剂在碱性环境中具有更好的稳定能力;随着激发剂模数和碱当量的增加,碱激发泡沫混凝土的沉降距逐渐增大,沉降时间逐渐缩短,沉降速率倍增;碱激发泡沫混凝土的早期稳定性是由泡沫本身的稳定性和碱激发混凝土浆体的协同作用所决定,在激发剂模数1.0、碱当量3%、矿渣与粉煤灰质量比为8∶2和复合型发泡剂发泡的条件下,可以制备出具有良好早期稳定性的碱激发泡沫混凝土.

The early stability behaviors with time‑varying of various foams in alkaline environment and alkali‑activated foamed concrete were studied.The results show that compared with plant foam agent and animal protein foam agent,compound foam agent has better stability in alkaline environment.With the increase of alkali activator modulus and alkali equivalent,the settlement distance increases gradually,and the settlement time of alkali‑activated foamed concrete shortens gradually,the settlement rate accelerates rapidly.The early stability of alkali‑activated foamed concrete is determined by the synergistic effect of foam stability and alkali‑activated concrete paste.Under the condition of activator modulus of 1.0,alkali equivalent of 3%,mass ratio of slag to fly ash of 8 to 2 and compound foam agent,alkali‑activated foamed concrete with favorable early stability can be prepared.